bpo-31569: correct PCBuild/ case to PCbuild/ in build scripts and docs (GH-3711)

diff --git a/Tools/msi/README.txt b/Tools/msi/README.txt
index 7023b61..1908f5c 100644
--- a/Tools/msi/README.txt
+++ b/Tools/msi/README.txt
@@ -64,7 +64,7 @@
 
 Before building the installer, download extra build dependencies using
 Tools\msi\get_externals.bat. (Note that this is in addition to the
-similarly named file in PCBuild.)
+similarly named file in PCbuild.)
 
 For testing, the installer should be built with the Tools/msi/build.bat
 script:
@@ -72,7 +72,7 @@
     build.bat [-x86] [-x64] [--doc] [--test-marker] [--pack]
 
 This script will build the required configurations of Python and
-generate an installer layout in PCBuild/(win32|amd64)/en-us.
+generate an installer layout in PCbuild/(win32|amd64)/en-us.
 
 Specify -x86 and/or -x64 to build for each platform. If neither is
 specified, both platforms will be built. Currently, both the debug and
diff --git a/Tools/msi/build.bat b/Tools/msi/build.bat
index f720ea9..8fa612e 100644
--- a/Tools/msi/build.bat
+++ b/Tools/msi/build.bat
@@ -1,7 +1,7 @@
 @echo off
 setlocal
 set D=%~dp0
-set PCBUILD=%D%..\..\PCBuild\
+set PCBUILD=%D%..\..\PCbuild\
 
 set BUILDX86=
 set BUILDX64=
diff --git a/Tools/msi/buildrelease.bat b/Tools/msi/buildrelease.bat
index 5dc1b57..4178981 100644
--- a/Tools/msi/buildrelease.bat
+++ b/Tools/msi/buildrelease.bat
@@ -28,7 +28,7 @@
 set DOWNLOAD_URL=https://www.python.org/ftp/python/{version}/{arch}{releasename}/{msi}
 
 set D=%~dp0
-set PCBUILD=%D%..\..\PCBuild\
+set PCBUILD=%D%..\..\PCbuild\
 if "%Py_OutDir%"=="" set Py_OutDir=%PCBUILD%
 set EXTERNALS=%D%..\..\externals\windows-installer\
 
diff --git a/Tools/msi/exe/exe.wixproj b/Tools/msi/exe/exe.wixproj
index 8eaf494..071501c 100644
--- a/Tools/msi/exe/exe.wixproj
+++ b/Tools/msi/exe/exe.wixproj
@@ -45,7 +45,7 @@
     </Target>
     
     <Target Name="_MergeMiscNewsWithBlurb" AfterTargets="PrepareForBuild" Condition="$(Blurb) != '' and !Exists('$(PySourcePath)Misc\NEWS')">
-        <Exec Command="$(Blurb) merge -f &quot;$(BuildPath)NEWS.txt&quot;" WorkingDirectory="$(PCBuild)" />
+        <Exec Command="$(Blurb) merge -f &quot;$(BuildPath)NEWS.txt&quot;" WorkingDirectory="$(PCbuild)" />
     </Target>
     
     <Target Name="_MergeMiscNewsWithPython" AfterTargets="PrepareForBuild" Condition="$(Blurb) == '' and !Exists('$(PySourcePath)Misc\NEWS')">
@@ -58,8 +58,8 @@
             <HostPython>@(HostPython)</HostPython>
             <HostPython Condition="$(HostPython.Contains(';'))">$(HostPython.Remove($(HostPython.IndexOf(';'))))</HostPython>
         </PropertyGroup>
-        <Exec Command="&quot;$(HostPython)&quot; -m pip install -U blurb" WorkingDirectory="$(PCBuild)" />
-        <Exec Command="&quot;$(HostPython)&quot; -m blurb merge -f &quot;$(BuildPath)NEWS.txt&quot;" WorkingDirectory="$(PCBuild)" />
+        <Exec Command="&quot;$(HostPython)&quot; -m pip install -U blurb" WorkingDirectory="$(PCbuild)" />
+        <Exec Command="&quot;$(HostPython)&quot; -m blurb merge -f &quot;$(BuildPath)NEWS.txt&quot;" WorkingDirectory="$(PCbuild)" />
     </Target>
     
     <Import Project="..\msi.targets" />
diff --git a/Tools/msi/launcher/launcher.wixproj b/Tools/msi/launcher/launcher.wixproj
index 8935ce8..7ff1690 100644
--- a/Tools/msi/launcher/launcher.wixproj
+++ b/Tools/msi/launcher/launcher.wixproj
@@ -20,16 +20,16 @@
     </ItemGroup>
     
     <Target Name="_EnsurePyEx86" Condition="!Exists('$(BuildPath32)py.exe')" BeforeTargets="PrepareForBuild">
-        <MSBuild Projects="$(PySourcePath)PCBuild\pylauncher.vcxproj" Properties="Platform=Win32" />
+        <MSBuild Projects="$(PySourcePath)PCbuild\pylauncher.vcxproj" Properties="Platform=Win32" />
     </Target>
     <Target Name="_EnsurePywEx86" Condition="!Exists('$(BuildPath32)pyw.exe')" BeforeTargets="PrepareForBuild">
-        <MSBuild Projects="$(PySourcePath)PCBuild\pywlauncher.vcxproj" Properties="Platform=Win32" />
+        <MSBuild Projects="$(PySourcePath)PCbuild\pywlauncher.vcxproj" Properties="Platform=Win32" />
     </Target>
     <Target Name="_EnsurePyShellExt86" Condition="!Exists('$(BuildPath32)pyshellext.dll')" BeforeTargets="PrepareForBuild">
-        <MSBuild Projects="$(PySourcePath)PCBuild\pyshellext.vcxproj" Properties="Platform=Win32" />
+        <MSBuild Projects="$(PySourcePath)PCbuild\pyshellext.vcxproj" Properties="Platform=Win32" />
     </Target>
     <Target Name="_EnsurePyShellExt64" Condition="!Exists('$(BuildPath64)pyshellext.dll')" BeforeTargets="PrepareForBuild">
-        <MSBuild Projects="$(PySourcePath)PCBuild\pyshellext.vcxproj" Properties="Platform=x64" />
+        <MSBuild Projects="$(PySourcePath)PCbuild\pyshellext.vcxproj" Properties="Platform=x64" />
     </Target>
     
     <Import Project="..\msi.targets" />
diff --git a/Tools/msi/msi.props b/Tools/msi/msi.props
index 2318d48..24a90bd 100644
--- a/Tools/msi/msi.props
+++ b/Tools/msi/msi.props
@@ -15,7 +15,7 @@
     </PropertyGroup>
 
     <Import Project="wix.props" />
-    <Import Project="..\..\PCBuild\tcltk.props" />
+    <Import Project="..\..\PCbuild\tcltk.props" />
 
     <PropertyGroup>
         <!--
diff --git a/Tools/msi/testrelease.bat b/Tools/msi/testrelease.bat
index 96fdf5e..02bcca9 100644
--- a/Tools/msi/testrelease.bat
+++ b/Tools/msi/testrelease.bat
@@ -2,7 +2,7 @@
 @echo off
 
 set D=%~dp0
-set PCBUILD=%D%..\..\PCBuild\
+set PCBUILD=%D%..\..\PCbuild\
 
 set TARGETDIR=%TEMP%
 set TESTX86=
diff --git a/Tools/msi/uploadrelease.bat b/Tools/msi/uploadrelease.bat
index 610b092..4753fd3 100644
--- a/Tools/msi/uploadrelease.bat
+++ b/Tools/msi/uploadrelease.bat
@@ -2,7 +2,7 @@
 @echo off
 
 set D=%~dp0
-set PCBUILD=%D%..\..\PCBuild\
+set PCBUILD=%D%..\..\PCbuild\
 
 set HOST=
 set USER=
diff --git a/Tools/msi/wix.props b/Tools/msi/wix.props
index fbb2d10..7269d34 100644
--- a/Tools/msi/wix.props
+++ b/Tools/msi/wix.props
@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="utf-8"?>
 <Project ToolsVersion="4.0" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
-  <Import Project="..\..\PCBuild\python.props" />
+  <Import Project="..\..\PCbuild\python.props" />
   
   <PropertyGroup>
     <WixInstallPath Condition="'$(WixInstallPath)' == '' and Exists('$(MSBuildThisFileDirectory)\Wix')">$(MSBuildThisFileDirectory)\Wix\</WixInstallPath>